Trocar



Patented @et 3U, 1923,

nutren stares TROCAR. A

Application'mea January 12, 1921.

To all whom t may concer/a:

Be it known that I, WILLIAM B. WusooTr, a citizen of the United States of America, and resident of Wellesley, in the county of Norfolk and State of Massachusetts, have invented new and useful Improvements in Trocars, of which the following is a specilfication.

This invention relatesto a trocar particu- W larly designed for use in obtaining blood from anima-ls at the time of slaughter in a condition suitable for -use as human food or for therapeutic purposes. The invention has to do with that type of instrument which w has a blade fixed to a tubular handle which constitutesa cannula adapted to follow the blade into the cut, and through which blood maybe conducted from the interior of the body penetrated by the blade to a suitable 9@ pipe or tube leading to a container. without coming in. contact with the outside of the animal, or `with any contaminating iniuences `exterior to the tissues severed by the blade. 1

In the use of instruments of this kind vheretofore used some difiiculty has been en -countered due to the tendency of the walls of the cut to close around the inlet end fof the cannula, and between the end of the can- 90 nula and theinterior region of the incision Vf where a large blood vesselis cut, thus obstructingl the free flow `of the blood to and through the cannula and causing the bloodto permeate into the tissues around the cut. 35 The principal object of they present invention is to provide an improved instrument` which will keep the passage open from the region of the inner part of the cut to the entrance of the cannula.

Theinvention resides principally in the meansA hereinafter described and particularly pointed out in the claims for spreading apart the walls of the cut region of the entrance of the cannula and 't5 for a substantial distance toward thev inner part of the cut to `facilitate the flow of blood therethrough.

tissues in 'the' serial no. 436,658.

In the accompanying `drawings which illustrate a preferred embodiment of the invention:-`

.Figa l is a side elevation, half in longitudinal section, of my improveditrocar;

Figa 2 is a side elevation viewed at right angles to Fig. l, partly in section and partly broken away; and

. Fig. 3 is an end of the trocar.

.The handle of the trocar .constitutes the cannula and consists of the innertube l and theshorter outer tube 2. The latter has lianges or beads 3 and 4 at its ends and a knurled or roughened surface 5 to provide afirm hand grip.' The tubes l and 2 are fastened together against relative rotation y thelset screw 6. Fixed 'to the forward end of the tubel. is a pointed blade 7, the bose of which extendsacross the tube. .The edge of theforward end of;tube l is curved ateach side ofits blade so as'to merge grad uallvV into the plane of the blade at each side asshown at .8; :th-us `permittingr the cannula to" slip freelyV into the cut formed by the blade. ,r i vpart of the bladebody is cut away as shownat 9j. andin the .space so formed is a rotatable spreader: member l0, which conorrus in shape to the opening 9. and when turned into the plane `of the blade forms in effect a continuation of the blade body. The spreader l() tapers from` its rear end orbase forward. andu is provided at its forward end with a pivot `pin l1 whichfits into a corresponding socketI in the forward end of the openingr 9. The rear end orbase of the spreader l() is fixed to 4a tubular shell l2 which constitutes a support for the spreader and `is mounted to turn freelyinsidc `of the tube 1. `The shell l2 extendsbeyond the lower end of the. outer tube 2 and is connected to an exteriorly knurled actuating sleeve 13rmounted on tube Ibelowtube 2. by means of a set screw 414: which extends through a bayonet slot ,15 in .tube l...`

.The lower end of tube 1 is `provided with p f 55 view of the bladed end a bayonet slot 16 for attachment to a flexible pipe or tube (not shown) running to a container.

In operation the user turns the spreader member 10, by means of the sleeve 13, intoV the plane of the blade 7, in which position it forms practically'a p art of the blade. He

entrance being facilitated by the forwardly The spreader tapered edges 8 of the tube. being flatwise of the blade will not interfere with the ready entrance ofthe instrument into the animal..

body of the animal, the operator gives the actuating sleeve 13. a quarter turn, limited by the slot 1,5, thereby rotating the spreader 10, through shell 12, to the `position shown in the drawing at right angles to the blade. Then by shifting the sleeve 13 longitudinally of the cannula to bring the screw 1a to the end of the offset 15 of the bayonet slot, the spreader 10 is locked in its operative ppsition transverse of the blade. The pivot pin slight endwise` movement will not pull the pinout of its socket. In this transverse positionthe spreader 10 will spread thetissues cut by the blade andhold the` wallsy of the;

cut apart in the cannula, and lfor a substantial distance toward the end of the blade, ting the blood to ,How freely from the interior ofthe cut into the end .of the tubular `handle or cannula, and thence to anysuitable container. opening to The aperture` 9 forms .an

the blood should be more copious at one side Aofthe blade than the other, substantiallyy Y willbe Iavailable ,to carry itaway,

I claim: e v 1.",Aninstrumentfor withdrawing blood from food' animals at the time of their slaughter, comprising a cannula, a blade for` forming an incision in the animal, and movablemeans adapted to spread apart the lips of `the incision formed bythe blade. l

2.' ,An instrument for withdrawing blood from food animals Aat the time of their slaughter, Vcomprising acannula, a blade KVfor` Vforming an"incision in the animal,`V and the blade. Y

means for spreading apart the walls of the incision, adapted inone lposition to lie flatwise of "theblade and capable of movement into. another position to lie .at an angle to V3. An ,instrument forwithdrawing., blood from food animals at the time of their slaughter, comprising a cannula, a blade for With theblade and for-l ward end of the cannula now buried in the 11 isvsufliciently long so that thisI thusf permit#Y the; inlet end'V of the` cannula at f both sides of the blade so that if the iowr of;V

slaughter, comprising a cannula, a blade for forming an incision in the animal, a movable spreadermember' and means mounted upon the Aexterior of thev cannula forzoperating*the'spreader-member; l Y

5. An instrument for withdrawing blood from food animals atthe time of their slaughter, comprising a cannula, a blade for forming an incision in the animal', a rotatable spreader and an actuating member on the exterior of the cannula Vfor rotating the spreader. y

6. An instrument for with-drawingiblood from. food animals at the time of their slaughter, comprising a cannula, a blade.

capable of forming the usual slaughtering. incision in the animal, a movable spreader member, and meansmounted upon the cannula yfor operatingthe spreader member to.

spread apart the walls of the incision.

7; trocar comprising a cannula, a blade yhaving an aperture in its body, and a spreader rotatably. mountedin said aper ture adapted to lie substantially in the Aplane of the blade, vand also to be rotated to aposiu tion transverse vof the pla-neef the blade. the region ofthe entrance of f S, A trocar comprising a. cannula, a blade having., an aperture in its body, and L a i spreader rotatably mounted in said apen Y j Y Yand an Aactuating member on the exterior ofthe lcannula to operate nthe spreader. y

9, A trocar comprising Ya cannula, a blade having an aperture'in its body, a spreader which the spreader is fixed mounted to ropositionedin saidxaperture, a support. to

ber on the exterior of the cannula to rotate. 'l

said support and. spreader. Y

`10. A trocar comprising a cannula, a blade havingnn aperture in .its body, a spreader positioned in said aperture,a Vtubularshellto which the spreader is'ixed mounted to rotate inside of the cannula, and. an actuatingmember on the exterior `of the cannula to rotate said tubular shell and. spreader. i

11. A trocar comprising a cannula, a blade lhaving an aperturegin its; body, and a spreader rotatably mounted .in said aperture adapted torlie substantially in the plane ofv the blade, and also to be rotated to a position transverse of the plane-of the blade, and means ,to lockfthe spreader initstransverse position. Y A Y 12. A trocar comprising a cannula havin an inner tube and an outer tube fastene together, the outer tube constituting a hand nula, and an actuating sleeve on the inner hold, a blade fixed to the inner tube having tube of the cannula beyond the end of the 10 an aperture in its body, a spreader posouter sleeve to rotate said tubular shell and tioned in said aperture, a pivot connection spreader.

between the forward end of the spreader and Signed by me at Boston, Massachusetts,

the forward end of said aperture, a tubular this 1st lday of December, 1920 shell to which the rear end of the spreader is fixed mounted to rotate inside of the`can- VILLIAM B. VVESCOTT. 

